<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>内部样式表</title>
    <style>
        div{
            color:blue;
            font-size:80px;
            /* border-width: 5px;
            border-color: black;
            /*border-style显示格式*/
           /* border-style:dashed; */
           /*也可以用一行表示border的样式*/
           border:red 8px double;
        }
    </style>
</head>
<body>
    <div>
        内部样式
    </div>
</body>
</html>